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| Louis III | |
|---|---|
 | |
| Elector Palatine | |
| Reign | 18 May 1410 – 30 December 1436 |
| Predecessor | Rupert III |
| Successor | Louis IV |
| Born | 23 January 1378 |
| Died | 30 December 1436 (aged 58) Heidelberg |
| Spouse | Blanche of Lancaster Matilda of Savoy |
| Issue | Mathilde Louis IV, Elector Palatine Frederick I, Elector Palatine Rupprecht |
| House | Wittelsbach |
| Father | Rupert of Germany |
| Mother | Elisabeth of Nuremberg |
Louis III (German: Ludwig III. der Ältere or der Bärtige) (23 January 1378 – 30 December 1436), was an Elector Palatine of the Rhine from the house of Wittelsbach in 1410–1436.